There's a diagram on this forum somewhere. Otherwise download the workshop manual. The Haynes manual is easily found, but not so good,as I remember. The electrics are relatively simple, even I could make sense out of them. Main problem I had was that all the wires had faded to the same grey colour,so I got a specialist to put a new loom in. It's been great since,and I know that all the wiring is in good nick and not crusty. A few hundred quid though...

She refused point blank to start last night, I walked in this morning and as I put the key in I said to her let's get to the end of the day with no issues shall we.....and she started!
Think I might call this car herrbie I know it's not a Beetle but she's definitely got personality.